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单选题
20.Which of the following is the main idea of the passage? ().
A
Evolution has equipped all creatures with a regular pattern of sleeping and waking.
B
The study of sleep is an important part of the evolutionary theory.
C
Sleeping patterns must be taken into consideration in the designing of robots.
D
The sleeping pattern of a living creature is determined by the food it eats.
答案解析
正确答案：A
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